Integration of AI and OR Techniques in Constraint Programming for Combinatorial Optimization Problems

Volume 7874 of the series Lecture Notes in Computer Science pp 325-331

Mixed Integer Programming vs. Logic-Based Benders Decomposition for Planning and Scheduling

  • André CiréAffiliated withLancaster UniversityCarnegie Mellon University
  • , Elvin CobanAffiliated withLancaster UniversityCarnegie Mellon University
  • , John N. HookerAffiliated withLancaster UniversityCarnegie Mellon University

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A recent paper by Heinz and Beck (CPAIOR 2012) found that mixed integer software has become competitive with or superior to logic-based Benders decomposition for the solution of facility assignment and scheduling problems. Their implementation of Benders differs, however, from that described in the literature they cite and therefore results in much slower performance than previously reported. We find that when correctly implemented, the Benders method remains 2 to 3 orders of magnitude faster than the latest commercial mixed integer software on larger instances, thus reversing the conclusion of the earlier paper.